Prev: Neon sign power supply question ????
Next: magnavox plays only background noises
From: Peter on 22 Jan 2010 14:54
We have a benchtop size peltier refrigerator made by
Salton, which has stopped refrigerating after about two
years of operation.

The p.c.b. has two LEDs, green and red, visible here.
http://members.shaw.ca/peasthope/SaltonPCB.jpg
The external fan still spins but the chamber is about
15 degrees C.

A few months back the p.s. failed and the two big
capacitors were obviously leaking. With new caps
the p.s. worked again.

Two questions before I consider troubleshooting.
* Are peltier devices short lived?
* Any ideas about what the LEDs indicate?

Thanks, ... Peter E.

From: William Sommerwerck on 22 Jan 2010 15:17
What does Salton say about it?


From: William R. Walsh on 22 Jan 2010 15:39
Hi!

> * Are peltier devices short lived?

Not that I know of. They are very simple devices, and I've had a few
operating on and off over the past several years.

However, they do use a LOT of power and sometimes the switches, power
sockets and wiring used to hook them up are not up to the task. I've
seen a lot of peltier-type coolers and "refrigerators" with burned
switches or undersized wiring.

> * Any ideas about what the LEDs indicate?

I'd have thought they might be used to indicate "heating" and
"cooling", but it appears not. Most of the devices I've seen have a
means by which to reverse the polarity of the DC power going into the
peltier, effectively swapping the "hot" and "cold" ends around.

If both lights are on and the unit is switchable between heating and
cooling, perhaps it is a fault indication? If there is a switch to
select between these modes, is it good? (If it had melted or failed
from the load, the unit might fail to operate altogether.)

I was more surprised to see a switchmode power supply in there. Every
peltier based device I have (new to old) has used a transformer-type
supply.

William
From: AZ Nomad on 22 Jan 2010 15:59
On Fri, 22 Jan 2010 12:17:21 -0800, William Sommerwerck <grizzledgeezer(a)comcast.net> wrote:
>What does Salton say about it?


what is google?
From: mike on 22 Jan 2010 21:10
Peter wrote:
> We have a benchtop size peltier refrigerator made by
> Salton, which has stopped refrigerating after about two
> years of operation.
>
> The p.c.b. has two LEDs, green and red, visible here.
> http://members.shaw.ca/peasthope/SaltonPCB.jpg
> The external fan still spins but the chamber is about
> 15 degrees C.
>
> A few months back the p.s. failed and the two big
> capacitors were obviously leaking. With new caps
> the p.s. worked again.
>
> Two questions before I consider troubleshooting.
> * Are peltier devices short lived?
> * Any ideas about what the LEDs indicate?
>
> Thanks, ... Peter E.
>
They don't like ripple on the DC.
 | 
Pages: 1
Prev: Neon sign power supply question ????
Next: magnavox plays only background noises